I looked in my old CarQuest book today:
270 '39-'62 #1935S
302 "52-'59 # 3013

I dug through my stash & some old gaskets. These numbers are on the gaskets. Measured with a yardstick.

I have a full 270 set Of Best Gasket for the next time. Head gasket # 595 Bore measured 3/7/8"
Victor 270 # 1653K this is from the label of a full set also that the head gasket is missing. Probably on my pickup. But the label says the Victor number replaces GM number 2135866

I also found two 302 gaskets McCord # 6340 & Victor # 3013 both measured 4 1/8"

I would order the Best Gasket because I think they are still in business and it would be fresh.You have to send ua a video of you racing!